I've been keeping an eye on your list to get some direction for my stuff.
You're going with the top mount aye, hard manifold to have found J. i didn't notice but did you go with an electric fan ?
I did the Defi setup myself, the din units although nice I thought were too small. I got some S14 Juran rails for recaro SRDs and put soem Evo1vs in, sitting pretty nice and low.
Lol me giving direction right. Yeah I was lucky to pickup the HKS mani, mistake was that I did not buy the wastegate and now I am trying to get it but the guys is not responding. My clutch fan is still there. Have read on many an australian site that electric has its downside if not done properly, definitely use a shroud if going that route. I ain't touching what is working proper. Trying to keep the interior all one brand so I already bought the Bride interior material just need to get the Bride Seats and I should be set, don't want Bride interior with Recaros seats, unless I redo them in plain black with Bride Center Gradation ..................thinking.
I am also going to be using the Trust Oil cooler setup from the GTT and get the appropriate oil filter relocator to mix and match, will see how that goes as most of the oil filter relocator setups are not AN screw type fittings but clamps instead so may have to fab something myself. The Defis are a pretty simple install and I have a dash pod for the S15 dash but I really don't want something saying hey look at the gadgets on my dash and then have some dumb fool try nabbing it. Also have an AEM wideband gauges to install as well.